GRANULAR MATERIAL PARTICLE SIZE DISTRIBUTION MEASURING METHOD AND GRANULAR MATERIAL PARTICLE SIZE DISTRIBUTION MEASURING SYSTEM

摘要

PROBLEM TO BE SOLVED: To create a particle-size accumulation curve in a wide particle size range from an image of a granular material.;SOLUTION: Granular materials S that are a mixture of granular materials having different particle sizes d are scattered, and an overall image G0 and a partial image G1 at a predetermined magnification are photographed. A particle size index Ii that is an area ratio of the detected granular materials at particle sizes equal to or larger than a plurality of predetermined coarse particle sizes di including a predetermined lower limit particle size d1 and equal to or larger than the predetermined lower limit particle size d1 to the overall image is calculated from the overall image G0, and the particle size index Ii is converted to an accumulation passage rate P(di), and a coarse particle-size accumulation curve P (d≥d1) at the particle sizes equal to or larger than d1 is created. The granular materials at the particle sizes equal to or smaller than the lower limit particle size d1 are detected from the partial image G1 for a plurality of predetermined fine particle sizes dj including the lower limit particle size d1 and equal to or smaller than the particle size d1, and a particle size index Ij of the predetermined fine particle sizes dj is calculated, the particle size index Ij is converted to an accumulation passage rate P(dj), and a fine particle-size accumulation curve P (d≤d1) is created. A particle-size accumulation curve P(d) is created by combining the coarse particle-size accumulation curve with the fine particle-size accumulation curve.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2016,JPO&INPIT